Two-column hydraulic extrusion presses



March 31, 1964 w. DOHRN 3,127,013

Two-COLUMN HYDRAULIC EXTRUSION PRESSES Filed Nov. 18, 1960 2 Sheets-Sheet 1 lll/l l March 31, 1964 w. DoHRN Two-COLUMN HYDRAULIC ExTRuSIoN PRESSES af/'"s'heets-sheet 2 Filed NOV. 18, 1960 United States Patent() 3 127 013 TWO-COLUMN HYDRUIIC EXTRUSION PRESSES Walter Dohrn, Dusseldorf, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany Filed Nov. 18, 1960, Ser. No. 70,237 Claims priority, application Germany Nov. 21, 1959 6 Claims. (Cl. 207-1) Hydraulic three-column and four-column extrusion presses are known in which a container is displaced from the bolster end. This arrangement however is not willingly adopted, since access to the die is rendered diflicult by the three or four columns and other appliances, such for instance as the die-displacing means, or the saw for severing the extruded product, and this is rendered still worse by arranging the container-displacing means at the bolster end. For this reason it has been usual in practice to elect the displacement of the container, usually through the medium of long rods, from the main press-cylinder end, the hydraulic cylinders containing the pistons for actuating these rods also being frequently arranged behind the main press cylinder.

The arrangement mentioned therefore requires Very long rods, which, on account of their length, must also be thick, but this is regarded as an undesirable technical and financial burden on the presses. The present invention seeks to obviate these disadvantages, and it consists in the combination of a container-displacing means working with two cylinders and applied to the bolster, with a two column arrangement of the press, in such a way that looking in the direction of the axis of the press, the two columns may be regarded as being located at two diagonally opposite corners of an imaginary parallelogram, and the cylinders of the container-displacing means at the other two corners.

The retraction cylinders of the press are preferably arranged on the same longitudinal axes as the containerdisplacing cylinders in the press-cylinder cross-beam. The axes of the retraction cylinders then form, with the axes of the two columns, the same parallelogram as the axes of the container-displacing cylinders.

In a press constructed in this way the accessibility from both sides is indeed good, but it is not the same towards both sides, since on one side a column is located above, but on the other side a container-displacing cylinder or a retracting cylinder, with corresponding piston rods in each case, is located above. In order that it may also be possible to remodel the press according to local conditions without employing new parts, the columns, according to a further development of the invention are interchangeable with the container-displacing cylinders in the bolster bores and with the press retraction cylinders in the cylinder cross-beam bores.

The invention is illustrated by way of example in the accompanying drawings, in which:

FIGURE l shows a side View of the press according to the invention, partly in axial sectional elevation;

FIGURE 2 shows an associated plan;

FIGURE 3 shows a View on the line IIL-III in FIG- URE l;

FIGURE 4 shows a section on the line IV-IV of FIGURE l; and

FIGURE 5 shows a section on the line V-V in FIG- URE 3.

On extensions 3 of a main press cylinder 1 of a horizontal extrusion press, two columns 2 are secured in the usual manner by means of nuts 4. In the main press cylinder 1 moves the main press piston 5, the front end of which is attached to the platen 6, which carries a ram or pressing stem 7. By 8 is denoted a press-block or billet, which, by means of the ram 7, is to be inserted in and extruded from a container 9. The container 9 is mounted in a containenholder 10, which, by means of two claws 11, is displaceable upon container slideways 12.

The container-holder has two projections 13, which are diagonally opposite to one another. At the points 13a, piston rods 14, which are attached by means of nuts 14a, serve for displacing the container upon the slideways 12. The two points 13a, and the center points 2a of the two columns 2, as shown in FIGURES 3 and 4 form a rectangle, the longer sides of which are vertical.

In the direction of the two arrows 15 in FIGURE 4 a severing device, such as, a shearing knife 16, can act upon the extruded product from above when the container 9 is withdrawn towards the right (FIGURES l and 2). A saw, not shown, may be arranged beneath the axis of the press, in order to exert a cutting action upon the extruded product from below.

Between the container 9 and the bolster 17, which is secured by means of nuts 20 to the columns 2, a horizontal slide 18 is displaceable transversely to the axis of the press upon a slideway 23. This slide accommodates two dies 19, one of which during each extrusion operation is located co-axially with the press, while the other is located away to one side of the axis, and is accessible for cleaning and exchanging purposes.

The rods 14 each carry a piston 21, slidable in a cylinder 22, which is provided with a cover 22a, and is accommodated in the bolster 17. The bore 24 in the bolster 17 which accommodates the cylinder 22 is equal to the bore 2S, which accommodates the column 2, so that the column and the cylinder are interchangeable. To enable this interchange to be carried out, the axes of the retraction cylinders 26, out of which extend the piston rods 27 attached to the platen 6, are in alignment with the axes of the container-displacing cylinders 22, and the four bores in the press-cylinder block, which serve for the accommodation of the columns 2 and of the press retraction cylinders 26, are all of the same dimensions.

In particular it can be seen from FIGURES 3 and 4 that in the region of the slide 18, with the dies 19, free space for working is provided on both sides, since neither the rods 14 nor the columns 2 form a hindrance. By the arrangement of the lower column 2 and the lower displacing rod 14 between the two slideways 12 of the container-holder 10, a particularly simple and spiace-saving arrangement is yielded, which in its turn is dependent upon the diagonal arrangement of the two columns 2 and of the two displacing rods 14. The advantages of the invention are also obtained if the points 2a, 13a, 2a, 13a do not form a rectangular parallelogram but a parallelogram with other angles.

I claim:

l. A horizontal hydraulic extrusion press, comprising: a bolster, a press-cylinder block, a main press cylinder in the press-cylinder block, an upper column and a lower column, both passing at one end through and secured to the bolster and at the other end passing through and secured to the main press cylinder, a container, two container-displacing cylinders arranged in the bolster, the axes of the columns and the axes of the container-displacing cylinders being parallel to the axis of the press, and these four axes, as seen in a cross-sectional view of the press, being located at the corners of an imaginary parallelogram, with the axes of the columns at diagonally opposite corners and the axes of the container-displacing cylinders at the other two diagonally opposite corners, the diagonals being at an inclination to the horizontal, so that the two columns are on opposite sides of a vertical plane containing the main axis of the press and also on opposite sides of a horizontal plane containing the main axis of the press, and the two container-displacing cylinders are also on opposite sides of the said vertical plane and also on opposite sides of the said horizontal plane.

2. A horizontal hydraulic extrusion press as claimed in claim 1, further comprising a severing device which acts in a vertical direction between (the bolster and the container.

3. A horizontal hydraulic extrusion press as claimed in claim 1, further comprising: a main press piston slidable in the main press cylinder, a platen secured to the main press piston, two lateral extensions of the press-cylinder block, and two retraction cylinders, for retracting the platen, provided one in each ofthe said lateral extensions, these retraction cylinders being co-axial with the container-displacing cylinders in the bolster, the bolster being formed with four bores of the same diameter, each capable of accommodating either a column or a container-displacing cylinder as required, and the press-cylinder block also being formed with four bores of the same diameter, each capable of accommodating either a column or a retraction cylinder as required.

4. A horizontal hydraulic extrusion press as claimed in claim 1, further comprising: a container-holder in which the container is mounted, a pair of slideways on which the container-holder can slide, these slideways being located one on each side of the vertical plane containing the main axis of the press, and the lower column, and the axis of the lower container-displacing cylinder, also being located one on each side of the said vertical plane, and between the two slideways, but nearer to the said vertical plane than the slideways.

5. A horizontal hydraulic extrusion press as claimed in claim 1, the axes of the two container-displacing cylinders being in the same vertical planes as the axes of the two columns, and being at the same vertical distance from the axes of the columns.

6. A horizontal hydraulicextrusion press, comprising: a bolster, a press-cylinder block, a main press cylinder in the press-cylinder block, an upper column and a lower column both passing at one end through and secured to the bolster and at the other end passing through and secured to the main press cylinder, a container, two container-displacing cylinders arranged in the bolster, a main press piston slidable in the main press cylinder, a platen secured to the main press piston, two lateral extensions of the press-cylinder block, and two retraction cylinders for retracting the platen, provided one in each of the said lateral extensions, these retraction cylinders being co-axial with the container-displacing cylinders in the bolster, the bolster being formed with four bores of the same diameter, each capable of accommodating either a column or a container-displacing cylinder as required, and the presscylinder block also being formed with four bores of the same diameter, each capable of accommodating either a column or a retraction cylinder as required.

References Cited in the le of this patent UNITED STATES PATENTS 1,574,792 Clark Mar. 2, 1926 1,859,753 Summey May 24, 1932 2,671,557 Reichl Mar. 9, 1954 2,933,184 Billen et al Apr. 19, 1960 2,949,186 Billen Aug. 16, 1960 2,954,869 Swansen Oct. 4, 1960 FOREIGN PATENTS 582,386 Germany Aug. 14, 1933 

1. A HORIZONTAL HYDRAULIC EXTRUSION PRESS, COMPRISING: A BOLSTER, A PRESS-CYLINDER BLOCK, A MAIN PRESS CYLINDER IN THE PRESS-CYLINDER BLOCK, AN UPPER COLUMN AND A LOWER COLUMN, BOTH PASSING AT ONE END THROUGH AND SECURED TO THE BOLSTER AND AT THE OTHER END PASSING THROUGH AND SECURED TO THE MAIN PRESS CYLINDER, A CONTAINER, TWO CONTAINER-DISPLACING CYLINDERS ARRANGED IN THE BOLSTER, THE AXES OF THE COLUMNS AND THE AXES OF THE CONTAINER-DISPLACING CYLINDERS BEING PARALLEL TO THE AXIS OF THE PRESS, AND THESE FOUR AXES, AS SEEN IN A CROSS-SECTIONAL VIEW OF THE PRESS, BEING LOCATED AT THE CORNERS OF AN IMAGINARY PARALLELOGRAM, WITH THE AXES OF THE COLUMNS AT DIAGONALLY CYLINDERS AT THE OTHER TWO DIAGONALLY OPPOSITE CORNERS, THE DIAGONALS BEING AT AN INCLINATION TO THE HORIZONTAL, SO THAT THE TWO COLUMNS ARE ON OPPOSITE SIDES OF A VERTICAL PLANE CONTAINING THE MAIN AXIS OF THE PRESS AND ALSO ON OPPOSITE SIDES OF A HORIZONTAL PLANE CONTAINING THE MAIN AXIS OF THE PRESS, AND THE TWO CONTAINER-DISPLACING CYLINDERS ARE ALSO ON OPPOSITE SIDES OF THE SAID VERTICAL PLANE AND ALSO ON OPPOSITE SIDES OF THE SAID HORIZONTAL PLANE. 